Timer



BEST AVAILABLE COP.

H. H. SHELTERS.

APPHCA ION LED MAR. 28 19" 1,313,561 Patented'Aug. 19,1919.

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UNITED STATES PATENT OFFICE.

HIRAM H. SHELTERS, OF BURLINGTON, VERMONT.

TIMER.

To all whom it may concern:

Be it known that I, HIRAM H. Sneurmzs, a citizen of the United States, res1d1ng at Burlington, in the county of Chibtenden and State of Vermont, have invented certain new and useful Improvements in Tuners; and I declare the following to be a full, clear, and exact descri ion of the nvention, such as will enable otlers skilled in the art to which it apperta-insto make and use the same;

This invention relates to timers, and it more specifically relates tojan in'iproved 1 removable attachment fora tuner of known construction.

One ofthe objects of.this invention 15 to rovide certain improvements on the well linown Ford timer, which enables the contact-race and carbon or other brush to be quickly and easilyremoved and replaced by other elements of their kind without the use of any tool.

Another object is to provide a device of this character in which the contacts which cooperate with the carbon also provide sccuring means whereby a set of spring clamps is permanently secured to the race so that the race and contacts and spring clamps constitute a. unitary member which may be quickly clamped to the original insulating ring of the timer and in closed circuit with the original contact elements of a Ford timer.

Another object is to provide a device of this character which consists of few and simple parts and may be manufactured at the minimum expense.

Another object is to provide a device of this character which is strong. durable, highly eilicient, convenient and thoroughly practical.-

(ither objects and advantages may become apparent to persons who read the following details of description in onnection with the accompanying drawing in whicl1- Figure 1 is a central sectional view through a portion of a Ford timer in which parts have been removed and substituted by my in'lproved timcrmechamsm;

the um. 2-2 m Fig. 1;

Specification of Letters Patent.

Patented Aug. 19, 1919.

Fig. 3 is a sectional view taken along the line 33 of Fig. 1;

Fig. 4 is an. end elevation of an improved brush holder;

Fig. 5 is a side elevation of the brush holder shown in F ig. 4, parts being broken out1 to more clearly disclose its construction; an

Fig. 6 is a sectional view taken along the line 6-6 of Fig. 5.

Referring to these drawings in detail, in which similar reference characters correspond with similar parts throughout the several views, the cam-shaft 10, the casing 11, the insulating race or ring 12, contact elements 13. and insulating washers 14 are of previously known construction, and are not, therefore, described in detail.

A carbon-brush 15 is supported within a, chamber 16 of "the brush holder which is generally indicated by the numeral 17 in F igs. 4, 5 and 6. This brush holder is prothe shaft. A washer 21 is provided with an annular flange which fits over the ends of the pin 20 and prevents accidental removal or displacement of the latter. A nut 22 is in screen-threaded engagement with the shaft 10 androiipcrates with the elements 20 and '21 for effectuall lockingthe member 17 on the shaft.

The carbon holder is preferably formed f sheet metal being stamped from a flat blank (not shown) and then formed as shown in Figs. 4 and 5, atongue 23 being struck up and turned inwardly of the chamber 16 so as to provide a seat against which a spring 24 is seated. The spring 24 normally presses the carbon 15 against. a. race 25 or against one of the contacts 26 of a series that extends through the race The race 21') is of insulating material. whereas the contact elements 26 are of conducting material.

For the purpose of removably securing the 2 1,313,561 BESTAVAILABLE-COP;

race and its contact elements within the easing 11, I provide a set of spring clamping elements 27 each formed of conducting material. The elements 27 are previously formed from sheet metal and each has one end secured to the race 25 by means of one of the contact. elements 26 as clearly shown in Fig. 1. The other end of each element 27 is substantially 3-shaped or formed with two clamping jaws :28 and 29 and a contact element 30 between the clamping jaws. The dual effect of each spring 27 is to press the contact element 30 int-0 closed circuit with one of the contact elements 13 and to clamp the insulating ring 12 with its jaws 28 and 29.. However, when it is desired to renew the race 25 or the carbon 15, the manipulative elements 31 which are formed at the extremities of the elements 27 may be pressed toward the center of the casing so as to disengage the insulating ring 12; and the elements 25, 26 and '27 may then be removed as a unitary member, and such mem- -,ber or a similar one may then be placed and lamped within the casing 11 by pressing he springs inward until they are in position to move outward into position for clamp-' ing the insulating ring 12.

From the foregoing description, it will be seen that I have provided a timer mechanism which may be renewed without the necessity of renewing themore expensive parts of the timer. Although I have described this embodiment of my invention very specifically, it is not intended to limit the invention to these exact details, but I'contemplate making minor changes within the scope of the inventive idea disclosed in the foregoingvdescription and appended claims.

' hat I claim is 1. In a timer, the combination with a set of contact elements, of a second set of contact elements, a brush movable to close circuit alternately with said second contact elements, and a set of clamping elements of conducting material each'removably secured by its inherent clamping effect to a contact element of one of said sets, each of said clamping elements being electrically connected to one of the contact elements of the nentlyfixed with relation to said race and removably secured by its inherent clamping efl'ect to the said ring and being normally in electrical connection with ohe oi the contact elements of each of said sets, and a. brush cooperative with said race and with the contact elements mounted therein.

3. In a timer, the combination with a set of contact elements, an insulating ring in which said contact elements are mounted, a second set of contact elements, an insulating race in which the second set of contact elements is mounted, a set of spring connecting elements of conducting material each permanently secured to said race and in closed circuit with one of the contact elements of the second said set, each of said sprin connecting elements being normally held' by 'it-s spring action removably in engagement with one of the contact elements of the second said set.

4. In a timer comprising a casing, an insulating element in the casing, and a set of contact elements extending through said insulating element and casing, the combination of n insulating race, a set of spring clamping elements of conducting material normally and removably clamped on the said insulating ring and thereby held in closed circuit with said contact elements, a second set of contact elements each in circuit with one of said clamping elements, 00

. and a bmslrcooperative with said race and sulating element in the casing, and a set of contact elements extendingthrough said in- 5 sulating element and easing, the combination of an insulating race, a set of spring clamping elements of conducting material normally and removably'clampedon the said insulating rin and thereby heldin closed circuit with said contact elements, a. second set of contact elements each in circuit with one of said clamping elements, and permanently securing it to said race so that said insulating race and spring clamping ele- I05 meuts constitute a unitary member that, may be detached and replaced by another memher of its kind .vvithout the use of any tool, and a brush cooperative with said race and the second set of contact elements.

6. A timer brush holder formed of a single 'blank of sheet material having one end bent about a central line to form a tubular shaft-embracing portion, the opposite I end of the blank being bent about a. central line parallel to the first said central line so as to form a tubular brush receiving portion, a tongue being struck up from;the blank and extending into the interior of said brush receiving portion so as to form aseat for a spring, a brush held by the receiving por- .tion, and a compression spring seated in times??? blank and extending into the interior of ing witnesses.

ing portion.

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as to form a tubular brush-receiving por- In testimony whereofl have herelinto set tion, a tongue being strucknp from the my hand in the presence of two subscribsaid brush-receiving portion so as to form HIRAM H. SHE LTE RSJ a seat fox :1 sprin to act against a brush I I I when said brush is eld by the brush-receiv- \Vitnesses: 4

GUY B. HORTON, IRENE M. LACEY. 

